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edit: supposedly, this is covered in the migration announcement: https://v4.zod.dev/v4/changelog#zcoerce-updates
Testing out v4 I stumbled upon a chain piping into z.coerce.date().
const date = z.union([z.string(), z.number(), z.date()]).nullish().transform((v) => (v === null ? undefined : v)).pipe(z.coerce.date().default(() => new Date()))Results in,
typescript [2345]: Argument of type 'ZodCoercedDate' is not assignable to parameter of type '$ZodType<any, string>'.
The types of '_zod.input' are incompatible between these types.
Type 'unknown' is not assignable to type 'string'.
The intention with this was to accept string | number | Date | null | undefined, map null -> undefined and convert undefined -> Date through the default call such that null and undefined would be converted to the current time.
Seeing this error made me think... and I ended up simplifying it with:
const date = z.null().transform(() => new Date()).or(z.coerce.date())Handling null first and then afterwards coercing the rest. That being said, v3 typed the pipe correctly without errors, but it may overcomplicate things.
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